[AS3]as3.0滚动条类很酷的很好用

[AS3]as3.0滚动条类很酷的，很好用

package zkl.controls 
{ 
    import com.greensock.TweenLite; 
    import com.greensock.easing.Back; 
    import flash.display.DisplayObject; 
    import flash.display.DisplayObjectContainer; 
    import flash.display.Sprite; 
    import flash.display.Stage; 
    import flash.events.Event; 
    import flash.events.MouseEvent; 
    import flash.geom.Rectangle; 
     
    /** 
     * 滚动条 
     * 约定滚动的控制的焦点都在左上角 
     * 滑块：可以被拖动的 
     * 滑道：滑块所在的拖动范围 
     * 内容：拖动滑块要触动的对象 
     * 使用实例： 
     * import zkl.controls.ZScrollBar; 
     * import zkl.controls.ZScrollBarDirection; 
     * var bar:ZScrollBar = new ZScrollBar(); 
     * bar._stage = this.stage; 
     * bar._target = _target; 
     * bar._slideBar = slideBarV; 
     * bar._scrollBar = scrollBar; 
     * bar._targetScrollLength = _target.height - mask.height; 
     * bar.init(); 
     * @author zkl 
     */ 
    public class ZScrollBar extends Sprite  
    { 
        //所在舞台 
        public var _stage:Stage; 
        //被滚动的内容 
        public var _target:DisplayObject; 
        //内容滚动的距离 
        public var _targetScrollLength:Number; 
        //滚动条的滚动方向 
        public var _direction:String = ZScrollBarDirection.VERTICAL; 
         
        //滑块 
        public var _scrollBar:Sprite; 
        //滑道 
        public var _slideBar:Sprite; 
        //四个方向的滑块 
        public var _upBar:Sprite; 
        public var _downBar:Sprite; 
        public var _leftBar:Sprite; 
        public var _rightBar:Sprite; 
        //滑块滚动的速度(只有设置的方向按钮，此值才有作用) 
        public var _barSpeed:Number = 5; 
         
         
         
        //滑块可以滑动的长度(有效的滑道) 
        private var slideLength:Number; 
        //滑块的滚动范围 
        private var barDragRect:Rectangle; 
        //对象的初始化坐标 
        private var targetXY:Number = 0; 
         
        //对象滚动的方向 
        private var scrollDir:int; 
        private static const UP:int = 0; 
        private static const DOWN:int = 1; 
        private static const LEFT:int = 2; 
        private static const RIGHT:int = 3; 
         
        public function ZScrollBar() { 
             
        } 
         
        /** 
         * 初始化 
         */ 
        public function init():void { 
            if (_stage == null)_stage = _target.stage; 
            if (_direction == ZScrollBarDirection.VERTICAL) {//垂直 
                //滑块的初始位置 
                _scrollBar.x = _slideBar.x + (_slideBar.width - _scrollBar.width) / 2; 
                _scrollBar.y = _slideBar.y; 
                //有效的滑道长度 
                slideLength = _slideBar.height - _scrollBar.height; 
                //滑块的可拖动范围 
                barDragRect = new Rectangle(_slideBar.x + (_slideBar.width - _scrollBar.width) / 2, _slideBar.y, 0, slideLength); 
                // 
                targetXY = _target.y; 
                 
            }else if (_direction == ZScrollBarDirection.HORIZONTAL) {//水平 
                //滑块的初始位置 
                _scrollBar.x = _slideBar.x; 
                _scrollBar.y = _slideBar.y + (_slideBar.height - _scrollBar.height) / 2; 
                //有效的滑道长度 
                slideLength = _slideBar.width - _scrollBar.width; 
                //滑块的可拖动范围 
                barDragRect = new Rectangle(_slideBar.x, _slideBar.y + (_slideBar.height - _scrollBar.height) / 2, slideLength, 0); 
                 
                targetXY = _target.x; 
                 
            }else { 
                throw new Error("direction的值设置有误，请参考ZScrollBarDirection.as"); 
                return; 
            } 
             
            setListener(); 
             
        } 
         
        //设置监听 
        private var tempBar:Sprite; 
        private function setListener():void { 
            //scrollBar 
            _scrollBar.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler); 
            //dir bar 
            if (_upBar != null) { 
                _upBar.addEventListener(MouseEvent.MOUSE_DOWN, dirDownHandler); 
            } 
            if (_downBar != null) { 
                _downBar.addEventListener(MouseEvent.MOUSE_DOWN, dirDownHandler); 
            } 
            if (_leftBar != null) { 
                _leftBar.addEventListener(MouseEvent.MOUSE_DOWN, dirDownHandler); 
            } 
            if (_rightBar != null) { 
                _rightBar.addEventListener(MouseEvent.MOUSE_DOWN, dirDownHandler); 
            } 
        } 
        //dir bar 
        private function dirDownHandler(e:MouseEvent):void { 
            tempBar = e.currentTarget as Sprite; 
            switch(tempBar) { 
                case _upBar: 
                scrollDir = UP; 
                break; 
                case _downBar: 
                scrollDir = DOWN; 
                break; 
                case _leftBar: 
                scrollDir = LEFT; 
                break; 
                case _rightBar: 
                scrollDir = RIGHT; 
                break; 
            } 
            tempBar.addEventListener(Event.ENTER_FRAME, dirEnterFrame); 
            tempBar.addEventListener(MouseEvent.MOUSE_UP, dirUpHandler); 
            tempBar.addEventListener(MouseEvent.MOUSE_OUT, dirUpHandler); 
        } 
        private function dirUpHandler(e:MouseEvent):void { 
            tempBar.removeEventListener(Event.ENTER_FRAME, dirEnterFrame); 
            tempBar.removeEventListener(MouseEvent.MOUSE_UP, dirUpHandler); 
            tempBar.removeEventListener(MouseEvent.MOUSE_OUT, dirUpHandler); 
        } 
        private function dirEnterFrame(e:Event):void { 
            switch(scrollDir) { 
                case UP: 
                _scrollBar.y = Math.max(_slideBar.y, _scrollBar.y - _barSpeed); 
                break; 
                case DOWN: 
                _scrollBar.y = Math.min(_slideBar.y + slideLength, _scrollBar.y + _barSpeed); 
                break; 
                case LEFT: 
                _scrollBar.x = Math.max(_slideBar.x, _scrollBar.x - _barSpeed); 
                break; 
                case RIGHT: 
                _scrollBar.x = Math.min(_slideBar.x + slideLength, _scrollBar.x + _barSpeed); 
                break; 
            } 
            updateTargetPos(); 
        } 
        //dir bar end 
         
        //scrollBar 
        private function mouseDownHandler(e:MouseEvent):void { 
            _stage.addEventListener(MouseEvent.MOUSE_UP, mouseUpHandler); 
            _scrollBar.addEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler); 
        } 
        private function mouseMoveHandler(e:MouseEvent):void { 
            _scrollBar.startDrag(false, barDragRect); 
            _scrollBar.addEventListener(Event.ENTER_FRAME, scrollEnterFrameHandler); 
        } 
        private function mouseUpHandler(e:MouseEvent):void { 
            _scrollBar.stopDrag(); 
            _scrollBar.removeEventListener(Event.ENTER_FRAME, scrollEnterFrameHandler); 
            _scrollBar.removeEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler); 
            _stage.removeEventListener(MouseEvent.MOUSE_UP, mouseUpHandler); 
        } 
        private function scrollEnterFrameHandler(e:Event):void { 
            updateTargetPos(); 
        } 
        //scrollBar end 
         
        //update 
        private var percent:Number = 0; 
        private function updateTargetPos():void { 
            if (_direction == ZScrollBarDirection.VERTICAL) { 
                percent = (_scrollBar.y - _slideBar.y) / slideLength; 
                //_target.y = Math.round(targetXY - _targetScrollLength * percent); 
                TweenLite.to(_target, 0.5, { y:Math.round(targetXY - _targetScrollLength * percent), ease:Back.easeOut } ); 
            }else if (_direction == ZScrollBarDirection.HORIZONTAL) { 
                percent = (_scrollBar.x - _slideBar.x) / slideLength; 
                //_target.x = Math.round(targetXY - _targetScrollLength * percent); 
                TweenLite.to(_target, 0.5, { x:Math.round(targetXY - _targetScrollLength * percent), ease:Back.easeOut } ); 
            } 
        } 
        //////////////////////////////////////////////////////// 
  
        /// 
    } 
     
} 

[AS3]as3.0滚动条类很酷的很好用